How to use this image tool
Resize an image locally while preserving aspect ratio by default.
How the browser processing works
- Reads the original dimensions from the selected image.
- Calculates a new size from your width, height, or preset.
- Draws the resized image to a canvas for download.
Formula
Proportional height = new width / original width x original height.
Example
Resize a 4000 x 3000 photo to 1280 px wide for a lighter web-friendly image.
Using your output
Use the new dimensions to create a smaller or more consistent image. Preserving aspect ratio helps avoid stretching.
Assumptions and limitations
- Upscaling can make images look soft.
- Output is generated locally in your browser.
Frequently asked questions
Why lock aspect ratio?
Locking aspect ratio prevents the image from looking stretched or squeezed.
Can resizing improve quality?
Downscaling can make files smaller, but upscaling cannot add real detail that was not in the original image.